Crossifre x8 vs x16 - Performance Difference?

I've done fairly extensive searching, but I can't seem to find any recent, in depth analysis of whether a normal user will notice any real performance boost running a crossfire setup in x16 link vs x8.

I ask because I'm building a new system, and although I'm not planning on going xfire initially, I likely will when the 4850 cards go dirt cheap in the far future, and I'm trying to decide if I need to get:

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128336

or if I should save some $$$ and just go with

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131299

Any info would be greatly appreciated.
5 answers Last reply
More about crossifre performance difference
  1. http://www.tomshardware.com/reviews/pci-express-2-0,1915-10.html

    that's a good question i would try for a better board if you can afford it
    there is a good combo deal on that asus board and a asus 4850
  2. Appreciate the reply, but that link is about the results with single cards on various pcie pipeline speeds, not crossfire results.
  3. his link should give you a rough idea on how it would work

    there would be a decrease in fps overall, but not enough for you to actually regret it
  4. Here is a review that should answer all your questions.
    It has 8 x 8, 16 x 4, 16 x 16. Also PCI 1 vs 2.


    http://www.legionhardware.com/document.php?id=761
  5. I went for the Asus board, the gigabyte one was out of stock, and the offer for the $30 off for the mobo/4850 combo was too good to pass up.
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